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MONTANA 4x4 TRAIL GUIDE · MT-0057

Flathead Pass

Flathead Pass Road · northern Bridger Range crossing · between Bozeman and Wilsall, Montana
3/10AGF Difficulty · Easy
~4 MIPoint to point (AGF record, onX); sources differ
WASHOUTSWest side, 2026 (onX, community)
USFSBozeman Ranger District; approaches: verify
COMMUNITY REPORTS SHOW 2026 WASHOUTS ON THE WEST SIDE, AND NONE HAS BEEN FILED SINCE AUG. 18. All current condition information is from onX community reports (third party, not official): on July 3, 2026 the road was reported "Obstructed / Washout" about a third of the way up (side not stated) after 3+ inches of rain; on Aug. 16 a reporter turned around near the top, calling it "super washed out"; on Aug. 18 two reports said Open, noting a rut section that lifts wheels. No report after Aug. 18 was found as of Oct. 8, 2026, and fall storms may have changed the washouts. No Forest Service alert or closure names Flathead Pass (Oct. 8, 2026), but that is not proof the road is passable. Private land: AGF's record says the west approach passes through or near private ranch land, and the lower approaches on both sides likely cross private ranch land and county roads (AGF research; not confirmed on an official source). onX (third party) says "it may seem like you are driving through a private ranch." Whether the public has a right of way across the ranch is unconfirmed: verify. Stay on the road and off private property. A 2023 IH8MUD forum post (third party) says the road is occasionally gated when the ranch at the bottom is moving cattle: leave any gate as you find it and do not cross a closed one. Whether the approaches are county road, Forest Service road or a private easement is unconfirmed: verify. The west side is one vehicle wide with limited turnarounds (TrailsOffroad, third party; Outside Bozeman, secondary). Winter: TrailsOffroad (third party) calls it "nearly impassable in the winter," and a Feb. 11, 2026 onX report (third party) described "a thick layer of ice and snow," washouts that felt dangerous and a trail close to the edge; TrailsOffroad says drifts build in the two meadows near the top on the west side. The Forest Service warns that district roads "may be unsuitable for certain vehicles during periods of inclement weather." Its MVUM seasonal designation for this road was not confirmed: verify. The 2023 MVUM labels it "Flathead Pass Rd," but no road number was confirmed: verify. The Forest Service says "Road access is best from the east side of the range." Check the current MVUM and land-manager rules before you go: official closures, posted signs and private property override this guide. Call the Bozeman Ranger District (406-522-2520) or the Custer Gallatin Supervisor's Office (406-587-6710) before you go, and read Know Before You Go.
AGF HAS NOT RUN THIS ROUTE. This guide is built from official sources (Forest Service) plus clearly labeled secondary sources. No AGF field visit is behind it, and the 3/10 rating comes from those sources, not from an AGF drive.
WHAT THIS GUIDE COVERS

Over the Pass, West to East

The Flathead Pass Road crossing of the northern Bridger Range, over Flathead Pass (6,842 ft, USGS GNIS), about 4 miles (AGF record; onX, third party, also gives 4). Trailforks (third party) lists 4.3 miles on the west side and 5.9 on the east. AGF has not fixed the exact endpoints: verify.

NOT INCLUDED: the Springhill Road and Rocky Mountain Road approaches, the Flathead Creek Road descent to MT-86, power-line and other side tracks (do not assume they are open to the public: check the MVUM), and any private ranch land.
WHY 3/10

Easy · Ruts on the West Side

AGF rates a trail by its hardest unavoidable obstacle in normal dry conditions. The west flank has a short, deeply rutted loose-rock climb and washout section that can lift a wheel and needs deliberate line choice; the rest is uneven hard dirt and rock, and the east side is much easier (AGF record). TrailsOffroad (third party) places a deeply rutted, angled climb about halfway to the summit. onX (third party) rates it 2; AGF rates it 3 because of the 2026 rutting and washout reports. AGF has not driven it.

Rock
3/5
Mud
3/5
Water
1/5
Exposure
3/5
Snow
5/5
Pinstriping
3/5

Snow, mud, runoff, deadfall and fire are condition changes, not part of the base rating.

ROUTE & MAP

Getting There

West side (harder; Outside Bozeman, secondary): from I-90 in Bozeman, exit at N. 19th Ave. and go north on Springhill Road. Pavement ends after about 11 miles, and a Flathead Pass Forest Service sign is at about mile 19. onX (third party) says the trail starts after you turn off Rocky Mountain Road onto Flathead Pass Road. Climb east to the pass. East side (easier; community sources): descend Flathead Creek Road to MT-86 (Bridger Canyon Road), then go south to Bozeman or north toward Wilsall. Exact mileages: verify.

LOADING MAP…
Custer Gallatin alerts →Bridgers MVUM (2023) →ROUTE FILE: not published yet

The pin marks the Flathead Pass summit (USGS GNIS point, 6,842 ft). It is a pass point, not a trailhead; onX (third party) puts the west start about 3.7 miles west. No downloadable track is published.

VEHICLE FIT

Rig Requirements

Stock 4x4
Yes
High clearance
Recommended
Tires
31-inch minimum
Rear locker
No
Front locker
No
Winch
No
Full-size
Limited
Body damage
Moderate risk

A stock 4x4 is the baseline; high clearance and good A/T tires are recommended, airing down helps, and low range is useful on the west climb and descent (AGF record). Full-size trucks can fit, but the west side is one vehicle wide with deep ruts and little passing room (AGF record). Carry a full-size spare or tire repair and basic recovery gear. Avoid winter travel.

TRIP PLANNING

Know Before You Go

Season
Late summer after the mud dries to early fall before snow (Outside Bozeman, secondary); no official season found; MVUM designation: verify
Typical trip
1–2 hours for the core route (AGF record), plus approaches
Camping
Limited (AGF record); verify
Trailer parking
Limited (AGF); verify
Turnaround
Limited; few on the one-lane west side
  • Hunting season: Montana's general deer and elk season runs Oct. 24–Nov. 29, 2026 (FWP). Expect hunters, camps and parked vehicles; wear blaze orange outside the vehicle. Archery season runs to Oct. 18. A youth deer hunt runs Oct. 15–16 (FWP). Expect parked rigs on the one-lane west side.
  • Bear country: Custer Gallatin food storage order 01-11-00-23-02 applies on the Bozeman Ranger District, Mar. 1–Dec. 1.
  • Mud: the first mile "can vary widely," from smooth gravel to deep mud ruts (Outside Bozeman, secondary). Do not drive it wet.
  • No wildlife or winter-range motorized closure for Flathead Pass was found in the official sources checked, but the travel-plan route tables were not available: verify.
  • Power lines cross at the pass (TrailsOffroad, third party); a side track is probably a power-company maintenance track (Bozeman Magazine, secondary). Do not assume side tracks are open.
  • Fire danger for the West Zone was Moderate on Oct. 8, 2026 (USFS). Check fire restrictions before any campfire.
SOURCES

Sources & Review

Last reviewed Oct. 8, 2026. No Forest Service closure is listed, but community reports show 2026 west-side washouts, the latest report is from Aug. 18, and the road number and seasonal status are unconfirmed. AGF has not run this route.

AGF ratings describe normal, dry-condition difficulty. They do not mean a route is legal, open or passable today. Spot something out of date? Use the Contact page.